View Full Version : Help with sighting a scope and use of different loads

07-02-2011, 11:30 AM
Hi I've got an AR-15 with a 20 inch barrel and a 1x9 twist rate. I have a scope I'd like to sight in, but I do not know what a good distance to sight in on is. Most land I have access to shoot at I'm limited to about 50 to 100 yards, but there are ranges where I can shoot much farther. So here's my problem: before I leave for school this summer, I've got this wild goal to hit a target at 500 yards. Unfortunately, as stated before most of my shooting takes place at a much closer range, so sighting in at 500 is not preferred. Also, I already have some 55 gr. rounds, about 170 of them, but I'm looking at a good deal for some 62 gr. steel core. After a quick search I couldn't find any bullet drop data that a new guy like me would understand. Also, I'm curious to know what more experienced shooters prefer, the 55 or the 62, since I only have one scope at the moment, so I can only sight it for one of the loads. Any info helps. Thanks!

07-02-2011, 11:40 AM

07-02-2011, 11:53 AM
What's the bullet compensation for a sight in at 100 yards? I coulda sworn I read somewhere that with the 62 at 200 yards, you would have to aim 3 inches high at 100 yards and 3 inches low at 300 yards. I'm wondering if that's true, and what would a similar set up for 55 gr. yield?

07-02-2011, 12:13 PM
A 100 yard zero is the standard for most rifles. What you are referring to is a "Battle sight zero" (or something like that, I do not use it). Zero your rifle at 100 yards and find the ammo that it groups best with. Then, gather the info you need to reach the distances you want. Every rifle will have a slightly differnet DOPE, so you will have to see how your rifle performs.

the led farmer
07-02-2011, 4:30 PM
AR 15 zeros (http://www.ar15.com/forums/topic.html?b=3&f=18&t=512335)

Bug Splat
07-02-2011, 5:01 PM
A lot of people like to sight in a 50 yards and then they are also dead on at 200. This is mostly for irons or reddots. Scopes are normally zeroed at least at 100 yards. You can make a range card that lists out the elevation needed out to 500 yards in either inches (for holding over), MOA (clicks on your scope turret), or mildots in your scope reticle.

Id suggest for a scoped rifle you pick one round and stick with it. Shooting two different weights will really change the point of impact. You want to sight your rifle in with the ammo you intend to shoot at longer ranges.

07-02-2011, 5:13 PM
That link was exactly what I was looking for. Thanks!